drm: xlnx: hdmi: Add FRL mode support in mode set

commit  627d8887ea2d43d995b21546b4a0f143a577c0c3 from
https://github.com/Xilinx/linux-xlnx.git

 xlnx_rebase_v5.10

This patch adds the FRL mode support in atomic mode set functionality.

Signed-off-by: Venkateshwar Rao Gannavarapu <venkateshwar.rao.gannavarapu@xilinx.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>